CMAL shipyard

Imtech Marine has been contracted to supply the electric and hybrid propulsion system for Scotland-based Caledonian Maritime Assets (CMAL) operated hybrid ferry.

Under the terms of the contract, Imtech Marine will carry out electrical installation for the third hybrid ferry, which is due to be delivered in April 2016.

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The company will also supply the diesel-electric and Li-Ion battery hybrid propulsion system by December.

The owner can track fuel usage with the help of an Imtech Marine remote control monitoring system installed on the third CMAL vessel.

According to Imtech, the first ferry used a lithium battery system, diesel generators and electric propulsion, and has been designed to reduce fuel, noise and emissions.

It is claimed to achieve fuel savings of 38%.

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The substantial reduction is achieved by using shore-charged energy (28%) as well as smart load control (10%) through the Imtech Marine Energy Management System (EMS).

“We estimated the propulsion system would result in savings around the 20% level but this result of 38% exceeded all expectations.”

The EMS removes the need for a second generator during the complete working day and controls fuel optimisation.

Based on a ‘market’ control strategy, it also controls the load sharing between the diesel generator and batteries, and uses Imtech Marine’s energy dashboard to provide essential performance feedback to the captain.

Information regarding exisitng and historic performance and maintenance values is provided to the fleet owner through the web-based remote monitoring system.

Mischa Kyanin of Imtech Marine said: “Originally we estimated the propulsion system would result in savings around the 20% level but this result of 38% exceeded all expectations.”

Image: Caledonian Maritime Assets’s (CMAL) shipyard. Photo: courtesy of Imtech.